Gang Beasts is a fun one and supports up to 8 players. Don’t use the native Linux version though. It’s pretty buggy but the Windows version works well with Proton.

Nidhogg is another fun one. It’s only two players at a time but you can do a tournament and it’s almost as fun to watch as it is to play. The sequel is good but I prefer the original for it’s simplicity.

Was also going to recommend Sea of Thieves! The water is incredible in that game.

I’ve been playing it and it’s been super fun. It’s still in early access so they’re still working out the kinks but it’s already very playable.